Figure shows two paths that may be taken by gas from an initial point i to final point f. Path 1 consists of an isothermal expansion (work is 50 J in magnitude), an adiabatic expansion (work is 40 J in magnitude), & then an adiabatic compression (work is 25 J in magnitude) –
Text Solution
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CHECK THE SOLUTION.
(a, b)
Δ U AB + Δ U BC + Δ U CD + Δ U DE = Δ U if
0 + (– W BC ) + 0 + (– W DE ) = Δ U if
– 40 J + (– (– 25)) = Δ U if
– 40 + 25 = Δ U if
Δ U if = – 15 J
For path AB: Isothermal process
Q AB = W AB = 50 J
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